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[GH-ISSUE #1113] [langchain]: ImportError: cannot import name 'ModelRequestHandler' from 'langchain.agents.middleware' #153

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opened 2026-02-17 17:19:17 -05:00 by yindo · 0 comments
yindo commented 2026-02-17 17:19:17 -05:00
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Originally created by @mcavdar on GitHub (Oct 23, 2025).
Original GitHub issue: https://github.com/langchain-ai/docs/issues/1113

Type of issue

issue / bug

Language

Python

Description

from langchain.agents.middleware import (
    AgentMiddleware,
    ModelRequest,
    ModelRequestHandler
)

Running the imports from this page results in the following error:
ImportError: cannot import name 'ModelRequestHandler' from 'langchain.agents.middleware'

I’ll update the examples soon based on the new documentation at: https://docs.langchain.com/oss/python/langchain/middleware#custom-middleware.

Originally created by @mcavdar on GitHub (Oct 23, 2025). Original GitHub issue: https://github.com/langchain-ai/docs/issues/1113 ### Type of issue issue / bug ### Language Python ### Description ``` from langchain.agents.middleware import ( AgentMiddleware, ModelRequest, ModelRequestHandler ) ``` Running the imports from [this page](https://docs.langchain.com/oss/python/releases/langchain-v1#custom-middleware) results in the following error: `ImportError: cannot import name 'ModelRequestHandler' from 'langchain.agents.middleware'` I’ll update the examples soon based on the new documentation at: https://docs.langchain.com/oss/python/langchain/middleware#custom-middleware.
yindo added the langchain label 2026-02-17 17:19:17 -05:00
yindo closed this issue 2026-02-17 17:19:17 -05:00
yindo changed title from [langchain]: ImportError: cannot import name 'ModelRequestHandler' from 'langchain.agents.middleware' to [GH-ISSUE #1113] [langchain]: ImportError: cannot import name 'ModelRequestHandler' from 'langchain.agents.middleware' 2026-06-05 17:25:21 -04:00
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Reference: langchain-ai/docs#153
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